Apparatus for applying a conductive coating to the surface of a mold used in the art of electrotyping.



G. E. DUNTON. APPARATUS FOR APPLYING A GONDUGTIVE COATING T0 THE SURFACE 0F A MOLD USED IN THB ART 0F ELEGTROTYPING.

APPLICATION IILBD DBG, 17,-1912.

1 1 1 1,442. Patented sept. 22, 1914.

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G. E. DUNTON.

APPARATUS FOR APPLYING A GONDUGTIVB GOATING To THE SURFACE 0F A MOLD USED 1N THE ART 0F BLEGTROTYPING.

APPLICATION FILED DEO. 17, 1912.

1 1 1 1,442, Patented Sept. 22, 1914.

4 SHEETS-SHEET 2.

'@VVENTR @Af/4V.

THE MORRIS PETERS cn., FHoro-LlTHo.. wASHrNGroN. D. c.

G. E. DUNTON.

APPARATUS FOR APPLYINLwA GONDUGTIVE GOATING To THE SURFACE 0F A MOLD USBD IN THE ART OF ELECTROTYPING.

APPLICATION FILED DBG. 17, 1912. 1,1 1 1,442.

4 SHEETS-SHEET 3.

Z5 37 57 5x 40 5E r I it/9.16.

NVENTOR AlforneJJ/q THE NORRIS PETERS co.. PHDTQLITHO.. WASHINGTON. D. c.

Patented 891915.22, 1914..

1,1 1 1,442. Patented sept. 22, 1914.

4 SHEETS-SHEET 4.

lV/TNESSES MMM. f 55M 11u-J Nokms PETERS ca.. PHo'm-LITHO.. WASHINGTUN. n, l

UNITED STATES PATENT oEEioE.

GEORGE E. ,DUNToim or NEW YORK, N. Y.

AEPARATUS EoR iPPLYING ii"y coivnUcTivE coATiNG To TEE SURFACE 0E A MOLD USED 1N TRE ART or ELEcTRoTYPiNG. v

T all whom t mag] conceive: l

Be it :known that I, GEORGE E. DUNTON,

i residing at New York city, county fof New York, State `of N ew York, a citizen of the United States, havel invented certain new and useful Improvements in `Apparatus for Applying a Conductive Coating to the Surface of a Mold Used in the Artof Electrotyping; and I do -hereby declare the followingHto be a full, clear, .and eXact descrip-v tion of `the invention, such as'will enable others skilled in the art to which `it pertains to make and use the same.

`My invention `relates. to improvements inA apparatus for applyingaoonductive coating to the surface of a moldused in lche art of electrotyping.

In pioducing printing plates `by the elec- Vtrotype process the wax mold is made by pouring melted or other suitable molding material over thin sheets of metal and allowing the waxto cool and after becoming sufli'ciently hard the surface of the mold is shaved oif until it presents a` perfectly smooth even surface when the form rcontaining the impression ofV the printing plat-e, desired to be produced, is pressed .into thisv surface, the form removed and the mold trimmed by meansof a heated knife which removes the more elevated portions and gives uniformity to the indentations which in the plate will be the reverse of the elevations in the `mold, and any grease, `oil or oily substance' `which `may have *been eX- pressed from` the mold, yby the pressure of the form, is also removed.y A coating of conductive material, such as liquid graphite, ,is then applied` to the mold surface in order that it shall become conductive to electricity and exercise the function of the cathode element in the electrolytic bath plnold is treated to a preliminary coatingor wherein it is to. receive the predetermined deposit of. metal. y Prior to its immersion in the electrolytic bath, and following lthe ad ministration of -the conductive coating, the

Speei-caton of Letters Patent. v Application mea December ia 1912.

Patented sept. 22, 1914. Serial No. 737,281.

which follows the iron enters into the solution in the form of a sulfate and the Cop per is displaced appearing as a precipitate 'of the metal onthe conductive coatedl surface of the mold, the mold is then rinsed otl" with to receive the desired deposit of metal and when this deposit of metal becomes of the desired thickness the mold is removed from water and hung in the platingibath e printing surface of the electrotype plate depends on the manner in which the conductive coatingis applied to the surface of the mold it is of theutmost importance that the coating-should be applied and distributed smoothly and evenly and made to absolutelyY cover the entire ksurface of the mold anal the indentations therein and not leave any portionsy of the same uncovered or any imperfections. i i

The object of my invention is to provide an apparatus which will apply the conductive coating evenly and smoothly to the en tire surface of the mold and the indentations, projections, '&c., iii or on its surface andthereby provide for the production of a perfect printing surface on the electrotype plate produced therefrom.

A further object is to provide means `for applying the conductive coating `to a mold, preferably having a 'surface provided with indentations, j but which may have projections on its surface or any other character of surface and which can be flat, curved or any other desired shape or contour.

A further object is to provide means for applying a conductive coating to the surface of a mold and to the indentations in its surface by projecting the said conductive coatinginto the indentations and onto the surface of the mold simultaneously at different angles. l

A further object is to provide means for applying a conductive coating to the surface of a mold and to the indentations in its surface by projecting the said conductive coating into the indentations at differient angles before the conductive coating drops, by force of gravity, from the surface of the mold.

A further object is to provide means for applying a conductive coating to an inverted mold, said means being above the surface of the body of the conductive coating in the receptacle containing vthe same.

'A further object is to provide means for rotating the mold and means for applying a conductive coating to the entire surface of the vwalls of the indentations.

A further object is to provide a rotatable and reciprocatory mold.

A further object is to provide means for rotating the mold while applying the conductive coating to its surface. 4

A further object is to pro-vide means for applying a conductive coating to the surface of a mold and the indentations therein by means of a rotatable mold and a rotatable and reciprocatory cylinder having means for projecting the coating therefrom.

A further object is to provide means for rotating and riprocating the means for projecting a conductive coating onto the mold.

A further object is to provide means for applying a conductive coating to the indentations in a mold and means for presenting different portions of said indentations to the action of the conductive coating.

A nal object is to provide an apparatus for the purpose set forth which is simple, inexpensive and durable in construction and easy and eifective in operation.

Referring to the drawings Figure 1 is a longitudinal sectional view partly in elevation. Fig. 2 a top plan view partly in section. Fig. 3 a sectional end view partly in elevation. Fig. 4 a detail top plan view of the mold carriage. Fig. 5 a detail sectional view of one of the mold clamping devices. Fig. 6 a plan view of one of the mold clamping devices. Fig. 7 a fragmentary sectional view of the mold turn table and its operating mechanism. Fig. 8 a top plan view of the pawl and ratchet device of the mold turn table. Fig. 9 a fragmentary plan view showing the mold carriage, turn table and operating parts. Figs. 10 to 15 inclusive are diafgrammatic views showing the various positions which the molds assume in applying the conductive coating. Fig. 16 a fragmentary sectional view of the mold and the conductive coating projecting and distributing means. Fig. 17 a detail plan view of thev rotatable and reciprocatory cylinder, T-heads and guides. Fig. 18 a top plan view of a modified form of the rotatable and reciprocatory cylinder.

vIn the drawings in which like reference characters denote like parts throughout the several views, 1 represents a suitable tank, receptacle or container for theiconductive coating of graphite of my apparatus,lmade preferably of wood lined with sheet metal but which may be made of any other suitable material, which is supported bymeans of legs 2 and provided with front and rear end walls 3 and 4, respectively, side walls 5 and 6, a bottom 7 slanting downward to the rear wall 4, and a top 8 having ahinged cover 9 with any suitable catch to keep it closed and a handle 10. l

The means for scraping up anyv graphite or other conductive coating which precipitates to the bottom of the tank, mixing the graphite and feeding it to the mixing means comprises ,-an endless` sprocket chain co-nveyer 11 having a series of Scrapers 12, preferably made of heavy sheet rubber, and mounted on sprocket wheels 13 on shafts 14 which extend transversely across the tank 1 and have their ends mounted in suitable bearings in the side walls 5 and 6 thereof, 15 being a mixing drum or cylinder mounted on shaft 16 extending transversely across the tank 1 and having its ends mounted in bearings in the side walls 5 and 6 of said tank and its front end extending through the side 6 of the tank, and 18a sprocket chain operatively connecting sprocket 19 o-n shaft 14 of the conveyer 11 with sprocket 20 on the shaft 16 of the mixing drum or cylinder. The Lipper portion of the mixing drum or cylinder is inclosed by a curved cover 21 which extends across the tank transversely `and is secured to the rear end wall 4 thereof by means of brackets 22. The means for withdrawing or exhausting the conductive coating of graphite or other suitable material, circulating the same and projecting it against the mold comprises, a pump 23, preferably of the rotary turbine type but may be any suitable liquid forcing device which will accomplish the desired results in a satisfactory manner. The pump 23 is connected to and communicates with thetank 1 by means of a short curved pipe 24, `by which the conductive coating is withdrawn or exhausted from said tank, and the outlet pipe 25 of the pump is connected toa vertical pipe 26 the upper end of which connects with a horizo-ntal pipe 27 the oppositeends of which are connected to short horizontal pipes 28 which pass through the upper portion of the rear wall 4 into the tank while the lower s" barrel33 having-a double row'of holes 34 and 35 through which the conductive coatv so \ of the reversing arms bymeans of arod 45a versing arm 44 engagingtheroller 41 and then slipping off the same, runder tension of ing is forced "as it is projected against the surface of the mold, Vsaid holes `are preferably `spaced apart at an angle of vforty-five degrees, but` they may be spaced apart at any desired angle, and said cylinder or barrel being pivotally` mounted inbearings 36 in the T-shaped castings 37 on eachA side. of

the Aslidablefframe 38, said castings being connected by lmeans of a bar 38` secured to the under portions of the same and each v'having hollow guides 39 and 40 projectingk therefrom which are slidably mounted in the shorthorizontal pipes 28 and `32, respec tively. `Suitable packing is provided to insure air and liquidv tight'joints between theA hollow'guides and the short horizontal pipes 28 and 32. One end ofthe cylinder or barrel 33 is jecting pin or lug 40m-and rollers 4l and'42 are mounted on spring arms 43 which inwv turn-are secured to the T-shaped4 castings in proximity to the `side6` of thetank 1.

44 and 45 are reversing arms pivotedto `the side wall 6 of the tank, 46 being levers also pivoted to the side wall 6 of the tank, one end of each of which isconnectedto one while the'opposite end isfconnected to a rod 47 slidably` mounted in a lbracket `48 and provided with a spiral spring 49, which surrounds the same, for retaining `said rodV a normally in its outward position andY 50 are nuts adjustable on said rods for regulating the tension of the spiral springs y49. The rotatable cylinder or barrel 33 is rotated in one direction,` viz., forwardly, by the rethe spring L49 on rod 47 atthe rear of the tank, and striking the pin or lug 40a and' throwing it forwardly l and the rotatable cylinder or `barrel is rotatedlin the opposite direction, viz., rearwardly, by the reversing arm 45 .engagingthe roller 42A and then slipping ofi the same, `under'tens'ionof the spiral spring 49 on rod 47 at the front of the tank,

land strikingV the 'pin or lug 40a and throwing it rearwardly". The slidable frame 38 and the cylinder or barrel 33, pivoted therethe bar 3821 of the slidable frame38 by means in, are reciprocated by means ofI an vinternally screw threaded sleeve 5l connected to of a link 52, said sleeve being 'mounted and adapted to move on the right hand screw threads 53 of the driving shaft 54 which has `right and left hand screwlthreads, 53.

and 55, respectively, said shaft 54 being mounted in tubular bearings56 in the front and rear end walls of the .ta-nk, therear end of they shaft 54 extending through `the rear end wall ofthe tank rand being mounted provided with an upwardly proin abearingi57 formed in a bracket 58 bolted to ,the outer face of `the said rearfendwall.v

The mold .carriage 59 consists-of anopen lframe 60 with aXles having small'wheels 64,

designed to" travel between the tracks 6l secured to the side walls5 and 6 of the tank,

inwardly projecting ledges anda plate 66 hingedy at one end thereof.

A turn table 67 is pivoted to the underside of the, plate V66 by means of a screwbolt68l pins are designed to register for the purpose of holding the turntable in its various positions whenapplying the conductive coating, and a spring controlled pawl 79 is provided which is mounted on aA screw 80 secured'in the turn table 67 and engages the ratchet 71 which prevents the, turn table from turning backward.

l Clamping devices 8l, for securing the mold 82r to the turn table, are provided havin bolts 83 passing through slotsf84 of the turn table and having heads 85 and eyes 86, wedge shaped, washers 87 mounted on the bolts 83 below the turn table, plates 88 with serrated edges mounted on the bolts 83 above the turn' table andresting thereon and camor eccentric levers 89 pivoted onshort shafts 90 mounted in the eyes 86. The hinged `plate 66 is provided with a central circular projection. or hub 911which surrounds the sleeve 70 and a cog Wheel 92 is keyed to the sleeve 70 just above this circular projection 91.

Bars 92a and 93` areslidably mounted in guides 94 projecting from vthe top of the hinged plate 66 and each is provided with a series o f teeth 96 whichmesh with the cog wheel 92.y When the mold carriage 59 moves tothe forward vend of the vtank on its first trip'the end `912L of bar 92'b1 will contact with I the frontend `wall of the tank which will cause said bar to slide rearwardly and by means of ythe te'eth.96v and cog wheel 92 the turn table 67 will be rotated tothe right, one fourth 'of a revolution. When the mold carriage 59 moves toward the'rear end of thetank, the end 97a ofthe bar 93 will contact with therear end Wall of the tank, which will cause the said bar to slide forwardly and by means of the teeth 96 and cog wheel 92 the turn table 67 will, be again rotated to theright, another`fone-fourth of a revolution. The bars 92a and 93 are returned 4to their normal positions by means of spiraly springs 98 attached-to said bars andthe 4plate 66.. By repeating this back vand forth movement, the turn table willbe rotated entirely around, each. time' `the moldcarriage makes four trips, and will present all sides' ofthe mold and the indentations therein, to the action of. the stream or jet ofv graphite projected thereon by means of the rotatable cylinder-or barrel 33. The'mold carriage is reciprocated by means of an'internallyl serewthreaded s'leeve'99, mounted on the-left hand screwthread of the driving vshaft 54 and connected-to the carriage by means of an upwardly extending arm or bracket 100. Therear end ofthe driving shaft 54 is provided with two bevel gears 101 and 102,

rotatable freely thereon, which are providedv with right and left hand projections, re-v spectively, and a clutch sleeve 103 is slidprojections, one end having aright hand projection and the other end having a left iand projection.

105 and 106 thereon and as the mold car' riage 59 moves rearwardly, it engages the adjustable stop 105 which lcauses the sleeve- 103, by means of the rod 104, yto be disen bevel gear 108 fast: thereon, which-is cle-.-

signed to drive alternately the bevel gears 101 and 102 and the opposite end is provided with a pulley 109 which is operatively connected with a pulley 110 on:the.pump

shaft 111 by means o-f a belt 112.

The outer end ofthe'pump shaft isprovided with a pulley 113 andthe outer end l`of the shaft 16 of the mixing drum is provided with a pulley 114 which is operatively connected to the pulley 113 by means of a belt 115. K

A driving lpulley 116 is mounted on the lpump shaft 110 and is designed to be connected by means of a shaft with an engine, motor or other motive power.

The operation ofthe apparatusy is as follows:-The mold carriage having been .broughtinto a position` at the extreme front ofthe tank and directly under the cover 9 thereof, the cover-is opened and avsuflicient quantityof graphite, previously mixed with water until it has acquired the proper' consistency such, Vfor instance, as of paste,

ably mounted on and keyed tosaid shaft 54 and is provided with right and left handV The sleeve". 103 is provided with a rod 104 having adjustable stops` cream oi" syrup, is` poured. intol the tank until yit is about one quarter or'onev third full or at .leastv deep enough .to entirely subnierge the `endless sprocket'chain conveyer 1l butl not of .suiicient depth totouch or Asubmerge Y the driving f shaft 54. The plate 66 Vof the mold carriage-is raised to a lvertical position, vand the .turnrtable being mounted thereon is. also raised, a waxmo'ld.

which has preferably been treated to remove any grease, oil or oily substance: is

then attached to -the underside of the turn;

tablel by meansl of the clamping devices 81, the .plate 66 is then lowered until it rests on the .ledges of the moldk carriage, carrying with it the turn tableand moldiwith the.`

mold with its face Adownyi'fard' and `is locked in place by meansogf a suitablecatch, and

the cover 9 of the tank vis closedi y The mold carriage, as has been-previously stated, being designed'to be started from the front ofthe tank .and the rod 104being moved 38 will bev in its rearward position. The.A

pump is then started by communicating; power tothe driving' rpulley 116 on pump shaft 110, the mixing drum, and endless sprocket chain conveyer .fand operated through the medium ofthe pulley 11,3, the

pulley 114'1and belt 115.. The suction pro` duced by the pump, causes th-e Y liquid graphite or other conductive coating, which has been thoroughly stirred or mixed .by

the mixing drum or cylinder15, to be .withfA drawnk from thek tank through the pipev 24 and forced, through the series ofpipes 25,

26, 28, 29, 30,r 31and 32 land through the hollow guides 39 and 40 ofthe slidable"` i frame 38 into the oppositev ends-of lthe rotatable cylinder or barrel 33 and through the .double rows of holes 34 and 35 andlprojectedgupvwardly against the surface of the v mold and the indentations therein, the-row of. holes .34 projecting the conductive. coatiio` ing vertically and the row of holes'35 pro jecting the conductive coating Vat an vangle of forty live degrees. The surplusconductive coating that does not adhere to the mold' drops back into the tankby force Vof gravity and is'again stirred and `mixed and used over again. As the apparatus `operates the mold carriage and mold'move inthe opposite direction from the slidable frame 38,y by reason of the rightand lefthandscrew portions on the driveA shaft which is turning from right to left, andthe rotatable the mold carriage moves towardthe '-rear of the tank, the slidable frame moves to` v'125 cylinder carried `thereby, that is to say, as y ward the front of thetank so that the con-v ductive coating of graphite is applied from the rear to the front of the mold. Asvthef mold carriage and mold move toward the rear of the tank and just before they reach the reversing point, the slidable frame hav- `or lug 40il on the rel and` turns it riageff and mold and "accomplished by the` engagement engagement of the clutch sleeve ing moved toward the front of the tank,

the reversing arm 45 contacts with the pin rotatable cylinder or baraXially rearwardly, which starts the application of the conductive coating of graphite from` the front to the rear of the mold and when the operation. is reversed, the arm 46 contacts with the pin or lug 40EL on therotatable cylinder or barrel and turns it axially forwardly, which starts the application of the conductive coating of graphite from the rear to front of the mold. As has been previouslyv stated, the `direction of movement of thev mold carthe vslidable frame 38 are accomplished by 'the reversal of the turning movement vof The direction of movement of said shaft is and dis- 104 With `thefbevel gears 101 and 102, said ing operated withthe stops 105 and 106 and sliding the rod 104 backward or forward.A

To illustrate .the various positions that the mold is causedto assume, in applying the conductivel coating to all sides of the indentations of )the mold and its D.` As the moldmarked A will bein front in the direction of travel and the conductive coatingwill be projected against the side of the mold marked C, and against the side ofthe indentations on that side, see Fig. 10, and the operation 'will continue as shown in the following figures, viz., 1l, 12, 13, 14 and 15.

In Figs. 10, 11, 12, and 13 the mold makesV a quarter turn atv each single trip of the carriage both at the front and rear. Figs. l14 and 15 the mold makes a quarter turny to each roundtrip of the carriage, from front to rear and back.

If found desirable,v the mold carriage and `mold. could be held stationary and have the 1 .conductive coating 5.0

- the adaptation of the .jector could be held` Y the mold carriage and mold reciprocate thereunder orthe conductive coating prostationary and have The; method is claimed in my application for `patent filed January 18th, 1913 Serial No., 742868.

,I do not desire to be understood as limiting myself to the specific details of construcabove the same.

`tion and arrangementas herein described andvillustrated, as it fis manifest that variations and modifications may be made in the features of Vconstruction and arrangement in device to various conditions of use without departing from the spirit and scope of my invention' andim- Itherefore reserve the rightprovements.

the drive shaft 54.4

sleeve beface, I have A, B, C and` projector reciprocate thereon,

to all such variations and modifications as properly fall within the scope of my invention and the terms of the following claims.

WWhat I claim is z 1. In a device of the character described, means adapted to hold an electrotype mold in an inverted position and means for applying a conductive coating upwardly in different and changing directions to the inverted surface of the mold, substantially as described.

2. In a device -of the character described, means adapted to hold an electrotype mold in an inverted position and means for `applying a conductive coating to the inverted surface of the mold and in different positions relative thereto, substantially as described.

3. `In a device of the character described, means adapted to hold an electrotype mold inan inverted position and means forl applying a conductivey coating upwardly in different and changing directions to the inverted surface ofthe mold and in different positions relative thereto, substantially as described. f

4. In a device of the character described, horizontally rotatable means adapted to old an electrotypemold having indentations therein in an inverted position and means for applying a conductive coating upwardly to the indentations and inverted surface of the same, substantially as described.

5. In a device of the character described, a mold carriage, a mold holder mounted horizontally thereon adapted to'hold a mold in an inverted position land means for applying a conductive coating upwardly to the inverted surface of the mold, substantially as described. f

In a device of the character described, horizontally movable means adapted to hold an electrotype mold having indentations therein in an inverted position and movable means for `applying a conductive coating to the indentations and'surface of the mold, substantially as described. I

7. In a device of the character described, a substantially horizontal reciprocatory mold carriage, a rotatable mold holder means for operating said mold carriage and'mold holder and means located below` the mold holder for applying a conductive coating to a mold carried by said holder upwardly, in a substantially vertical direction substantially as described.

8. In a device of the character described, a mold carriage, an inverted movable mold holder thereon, and means for applying a conductive coating upwardly to a mold carried by said mold holder operated simule taneously, substantially as described.

9." In a device of the character described, a `mold carriage,pa :i-otatalzxle mold holder,

and movable means for applying a conductive coating upwardly to a mold carried by said mold holder all operated by the same means, substantially as described. 10.. In a device of the character described, a reciprocatory mold carriage, an inverted horizontal mold holder rotatable thereon, means for operating said mold; carriage and moldholder and movable means under the mold holder for applying a conductive coating to a mold carried by the holder, substantially as described.

' 11. In a device of the character described, a mold carriage, an. inverted rotatable mold holder thereon and means for applyingr a Conductive coating to a mold carried by the holder all operated by the same means, substantially as described.

12. In a device of the character described, a reciprocatory mold carriage, adapted to carry an inverted rotatable mold thereon and reciprocatory and rotatable means for applying a conductive coating to the mold, substantiallyy as described.

13. In a device of the character described, a reciprocatory mold carriage, adapted v'to' carry an inverted rotatable mold thereon and a reciprocatory rotatable conductive ycoating cylinder projector having rows of holes therein, one row being at an angle to the other, substantially .as described.

14:. In a device of the character described, a reciprocatory mold carriage, adapted to carry an inverted rotatable mold thereon, a reciprocatory cylinder provided with holes and means for supplying said cylinder with al conductive coating and projecting said coating through the holes therein onto the surface and mold, substantially as described.

15. In a device of the character described,r anA inverted rotatable mold holder adapted to carry a mold, a movable cylinder under said mold and holder provided with rows of radially arranged holes and means for supplying said cylinder with a conductivecoating and projecting said coating through said holes upwardly onto the surface and indentations of the mold, substantially as def' vdrive shaft, means der, and means for y stantially as described.

scribed.

1.6. In a device of the character described, an inverted movable mold, rotatable means for .supporting said mold, a cylinder under said mold provided with rows ofl radially arranged holes and means for supplying said cylinder with a conductive coating and projecting saidv coating through said holes upwardly onto the surface and indentations of the mold, substantially as described.

17.. In a device of the character described, an inverted movable mold holder and a cylinder movable simultaneously therewith, holes insaid cylinder' and means for supply- .ing said cylinder with aconductive coating ,andproj ectingsaid. coatingxthrough thesaidtion andV means indentations of the invertedk cylinder with holes,

holes onto the surface andindentations of'a mold, carried by said mold holder, substantially as described.. i

18. In a device of the character described, an inverted movable mold holdervadaptedy to Acarry a mold, rotatable means for applying a lconductive coating upwardly thereto and means for` rotating said mold holder to pi'esent each side of the mold in turn to the action of the conductive coating,substantially as described. v

19. In a device ofthe character described, ar substantially horizontal mold holder adapted to carry amold, rotatable meansfor applying a conductive coatingy to themol'd upwardly in a substantially vertical direcfor rotating said mold to present veach side of the indentations vof the mold in turn to the action of the conductive coating, substantially as described.

20. In a device of the character described,` a driving shaft having right and `left hand screwthreaded portions, a mold.V carriage having a mold holder and operativelyconnected to one of said screwthreaded portions` andy 'a conductive coating projectorroperlatively connected to the otherscrewthreaded oi'tion and means shaft, substantially as described.

21. In a device of the character described, an inverted movable mold holder adapted to carry a mold provided with indentations, movablek means for applying a conductive coating to the walls of the indentations and means for rotatingthe inverted mold holder -and presenting the several sides of the indentations of vthe mold successivelyto the action of the conductive coating, substantially as described.

22. In a device of the character described,

1 a mold carriage adapted Yto carry an invert.-

ed mold thereon, aslidable frame having a means 'for supplyinr said cylinder with a conductive coating and rojecting the same onto the mold, a drive shaftoperatively connected to said mold carriage and the slidable frame, means on the mold carriage for through the said holesf for rotating saidy driving` reversing the direction 'of rotation -of the for rotatingv said cylinturning said mold, sub- 23. In a device of the character described, a tank having a conductive coating therein,

rotary mixing means for said conductive coating, a mold carriage having an inverted rotary mold holder adapted t0 carry a mold, a cylinder .having holes, means forwwithdrawing the conductive coatingfrom the tank` and supplying it to the cylinder 'and the ends of said vble cylinder mounted a tank having a conductive coating therein, rotary mixing means for said `conductive coating, means for `feeding said mixing means, an inverted movable Vmold holder adapted to carry a mold, a conductive coating projector'under said mold above the `surface of the conductive coating in 'the tank and means for' WithdraWingthe conductive coating from said tank and supplying it to the projector and projecting it up- Wardly onto the mold, substantially as described. l j

25. In a device of the character described, an inverted mold holder adaptedto carry 'a mold, a system of pipes, a frame slidable in pipes, a cylinder having holes and rotatably mounted in said frame and means for supplying a conductive coating to said `cylinder andprojecting it through said holes onto the mold, substantially as described.

26. In a device of the character described, a tank having a' conductive coating therein, a mold carriage having a turntable adapted to carry an'inverted mold, a system of pipes connected to said tank, a frame slidably mounted in the ends of said pipes, means for sliding said frame, a perforated rotatain said frame and means forrotating'the same, and means for withdrawing the conductive coating from the tank, supplying it to the rotatablecylinder and projecting it 'through the perforations of the same onto the mold, substantially as described.

27; In a device of the character described, a driveshaft having right andkleft hand Copies of this patent `may be obtained for five cents each, by addressing the l Washington, D. C.

screvvthreaded portions, means said shaft, a reciprocatory mold carriage operatively connected to one of the yscrewthreaded portions of the drive shaft and provided with a turntable adapted to carry an inverted rotatable mold, means for rotating said mold, a rotatable and reciprocatable perforated cylinder under said in-v verted mold operatively connected to the other screwthreaded portion of the drive shaft, means for rotating said cylinder, means for reversing the direction of rotation of said drive shaft and means for suplying a conductive coating `to said cyliner and projecting it through the perforations therein onto the mold, substantially as described. Y

28. In a device of the character described, a drive shaft, a mold carriage operatively for rotating connected to the same and provided With a rotatable turn table adapted to carry a mold, a movable perforated cylinder operatively connected to the drive shaft, means for supplying a conductive coating to the said perforated cylinder and projecting it through said perforations onto the mold, means for rotating the turn table and mold at each end or limit of travel of the mold carriage and means for rotating the perforated cylinder, substantially as described,

In testimony whereof, I atlix my signature in the presence of two Witnesses.

GEORGE E. DUNTON.

Witnesses:

HENRY W. BECKER, NETTIE F. FAIRCHILD.

Commissioner of Patents, 

